Dope it with germanium: selective access to functionalized Si₅Ge heterocycles

Abstract

The Cl– diadduct [nBu4N]2[A·2Cl] of the mixed cyclohexatetrelane (SiCl2)5(GeMe2), A, is accessible from Me2GeCl2, 6 eq. Si2Cl6, and 2 eq. [nBu4N]Cl in one step (96%). Free, tenfold functionalized A can...

Group IV heteroadamantanes: synthesis of Si6Sn4and site-selective derivatization of Si6Ge4

“…Specifically, we prepared open-chain species (Cl 3 Si) 4 Ge 21,22 or Cl 3 Si-(R 2 Ge) n -SiCl 3 (n = 1, 2; R = Ph, nBu) and applied them as precursors in the chemical vapor deposition (CVD) of Si x Ge 1Àx alloys after hydrogenation. 23 The use of Me 2 GeCl 2 gave access to (Cl 2 Si) 5 -(Me 2 Ge) monocycles 24 and even the tricyclic heteroadamantane Ge[2], which contains two SiCl 2 units together with four GeMe 2 and four Si-SiCl 3 vertices in the cluster core (Scheme 1; general formula E[X]: Si,E-adamantane with ''X'' SiCl 2 groups in the cluster core). 25 A Cl À ion-induced rearrangement reaction leads from Ge[2] to Ge[1] (one remaining SiCl 2 ), and Ge[0] (zero remaining SiCl 2 ) at room temperature and 60 1C, respectively.…”